Unit 2.3
QuantifyingThis unit emphasizes the importance of the relationship
between macro and micro, and deals with understanding the
properties of matter through observation and calculation.
Video program cues: 14:05-23:20

Diluting
color demonstration and activity

Pernell Williams conducts an activity about the relationship
between concentration and color.

“I was thinking, as we
were having this discussion about getting students to understand
things that they cant see, that historically, teaching
students chemistry in high schools and universities involved
having them do lots of calculations about things that they
cannot see. You have a couple of problems there [in teaching
chemistry]. One, is the things [the students] cant
see, and two, its the first time that they really
have to deal with a quantitative science. And when you combine
the two  trying to do math involving things they cant
see, this adds an extra dimension of difficulty in trying
to come up with models which can help them correctly visualize
whats going on.”

Dr. Leslie Pierce
Thomas A. Edison High School, Virginia

Link

A Java applet about Beers
Law, which relates the absorbency of a solution and
its concentration. May be used with more advanced students.